Bore Tech's TEF-DRI is a revolutionary dry lubricant. Composed of sub-micron Teflon particles in a quickly evaporating carrier, TEF-DRI is able to penetrate deep into the metals surface leaving a tough, long lasting, dry lubricating film behind. This coating is unsurpassed in performance. Due to its unique composition, TEF-DRI is suitable for all temperatures. it will not freeze, will not attract harmful dust and debris and will not rub off.